What about a cheap (used) lens? A 25mm lens is a +40 diopter one with
quite a flat field, lots of elements, etc.
I do hava a (very old) Schneider 8x loupe, but it is only for slides
(opaque sides) and I sometimes use lenses in my bag for easier viewing.
Though I've not run any extensive tests about eye fatigue (I've always used
them for short whiles) image quality is really good.
Rgds.
Martin
www.martintrucco.com.ar
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